At least on Linux, the notification spec supports specifying the timeout for every notification. It would be great if this option is exposed to the top-level API as timeout: int = -1 (-1 means OS default).

Bonus

For other OSes, maybe this can be implemented by spawning an async Timer task that will clear the notif after expiration.

PS: Thanks for making this project. It is extremely useful to have a singular and full-featured interface for cross-platform notifications! :)